Arthritis
Arthritis causes a reduction in cartilage (which increased the friction) between the joints. When cartilage becomes damaged or worn down, the affected joint usually becomes inflamed and restricts motion, causing pain. Osteoarthritis gradually develops as we age, whereas Rheumatoid Arthritis often has system-wide symptoms and a genetic relationship.
Bursitis
Bursae are fluid-filled cavities that reduce friction and assist in joint movement. Chronic overuse, trauma, infection, or arthritis may cause inflammation, joint pain, stiffness, and swelling. Symptoms usually improve with conservative treatment.
Complex Regional Pain Syndrome
Chronic progressive disease that commonly affects the extremities by causing severe pain, swelling, and noticeable changes in the skin. The cause of CRPS is unknown, but is thought to be a result from damage to the nervous or circulatory system. Blood flow and sensation are no longer properly regulated and may cause various problems in the muscles, bones, nerves, and skin.